Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f73868d21d5513658be6931b8ef808fa712bfe4617c2b3b15e7cf2ba196ad4c' 
  AND token = 'Zny3jqtYAF+5RX7q+IByLrikOislyDVObFFL9Nq9aQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}